Sanitary napkin



FIG. 1 is a top plan view of a sanitary napkin, showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front elevational view thereof, the rear view being identical; and,

FIG. 4 is a right side elevational view thereof, the left side view being identical. 

The ornamental design for a sanitary napkin, as shown and described. 